java 将菜单栏添加到 JFrame
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Adding Menubar to JFrame
提问by zey
I have the following source code and i just dont get why my menubar/menu wont show on the JFrame, im somewhat new to programming
我有以下源代码,我只是不明白为什么我的菜单栏/菜单不会显示在 JFrame 上,我对编程有点陌生
public class drawingApp {
public static void main(String[] args) {
JFrame frame = new JFrame("DrawingApp");
frame.setSize(600,800);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
JMenuBar mb = new JMenuBar();
JMenu menu1 = new JMenu("Colour");
mb.add(menu1);
JMenu menu2 = new JMenu("Size");
mb.add(menu2);
frame.setJMenuBar(mb);
}
}
回答by Roan
I am not 100 % sure why the JMenu
's don't show up but it's probably because there are no items in the JMenu
's and therefore they are not rendered.
我不是 100% 确定为什么JMenu
's 没有出现,但这可能是因为JMenu
's中没有项目,因此它们没有被渲染。
So this is what was going wrong you created the JMenuBar
the Menu
's but not the JMenuItems
. This is how you create a JMenuBar
:
所以这就是你创建JMenuBar
了Menu
's 而不是JMenuItems
. 这是您创建一个的方式JMenuBar
:
JFrame myframe = new JFrame();
JMenuBar menubar = new JMenuBar();
JMenu menu = new JMenu("size");
JMenuItem size = new JMenuItem("size");
menu.add(size);
menubar.add(menu);
myframe.setJMenuBar(menubar);
I hope this helps :)
我希望这有帮助 :)
回答by Paul
You add the menubar after your frame has been set visible. Due to this, the frame is first rendered and afterwards the menubar is added. Try:
在您的框架设置为可见后添加菜单栏。因此,首先渲染框架,然后添加菜单栏。尝试:
frame.setJMenubar(mb);
frame.validate();
frame.repaint();
this should solve the problem.
这应该可以解决问题。